A full count done by one person in a shop of any size means closing, or a very long night. Splitting the floor between three or four people and letting each enter their section is what makes a whole-shop count practical often enough to be useful.
The output you want is the variance list — book stock against counted stock, line by line, with gains and losses separated. Posting the adjustment is one step; reading the list before you post it is where the value is, because the lines that surprise you are the ones worth investigating.
Practical note: agree the cut-off before you start. Counting a shelf that is still being sold from produces a variance that means nothing, and is the most common reason a stock take has to be redone.